1const MyFunctionnalComponent: React.FC = props => {
2  useEffect(() => {
3    // Using an IIFE
4    (async function anyNameFunction() {
5      await loadContent();
6    })();
7  }, []);  
8  
9  return <div></div>;
10};

1const getUsers = async () => {
2 const users = await axios.get('https://randomuser.me/api/?page=1&results=10&nat=us');
3 setUsers(users.data.results);
4};
5
6useEffect(() => {
7 getUsers();
8}, []);

1useEffect(() => {
2  (async function anyNameFunction() {await loadContent();})();
3}, []); 

1function myApp() {
2  const [data, setdata] = useState()
3
4  useEffect(() => {
5    async function fetchMyAPI() {
6      const response = await fetch('api/data')
7      response = await response.json()
8      setdata(response)
9    }
10
11    fetchMyAPI()
12  }, [])
13}

1function Example() {
2  const [data, dataSet] = useState<any>(null)
3
4  useEffect(() => {
5    async function fetchMyAPI() {
6      let response = await fetch('api/data')
7      response = await response.json()
8      dataSet(response)
9    }
10
11    fetchMyAPI()
12  }, [])
13
14  return <div>{JSON.stringify(data)}</div>
15}

1 function OutsideUsageExample() {
2  const [data, dataSet] = useState<any>(null)
3
4  const fetchMyAPI = useCallback(async () => {
5    let response = await fetch('api/data')
6    response = await response.json()
7    dataSet(response)
8  }, [])
9
10  useEffect(() => {
11    fetchMyAPI()
12  }, [fetchMyAPI])
13
14  return (
15    <div>
16      <div>data: {JSON.stringify(data)}</div>
17      <div>
18        <button onClick={fetchMyAPI}>manual fetch</button>
19      </div>
20    </div>
21  )
22}
23